Cryptology ePrint Archive: BibTeX Citation of Report 2010/485

@misc{cryptoeprint:2010:485,
    author = {Hamid Mala and Mohammad Dakhilalian and Mohsen Shakiba},
    title = {Cryptanalysis of Block Ciphers Using Almost-Impossible Differentials},
    howpublished = {Cryptology ePrint Archive, Report 2010/485},
    year = {2010},
    note = {\url{http://eprint.iacr.org/}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.